Pillow case full of oranges
12 is around that time when they go from girls to insane hormone factories.
Which can be difficult to control, find an adult female role model over Mom who can talk with her and rule #1 is you don't ask what is said or talked about.
That rules shows more trust over then the typical she just says she don't tell you anything. If she thinks your asking and proding for info, she might not tell something important.
Or again a pillow case full of oranges
[no bruses]